The Arizona Technical Testing Institute (ATTI) is a
nonprofit organization formed to promote the highest standard
in highway construction materials sampling and testing through
certification technicians.

ATTI certification emphasizes a hands-on approach,
that is, technicians must satisfactorily perform test methods as well
as pass a written exam to receive certification. The
organization is represented by members from the Arizona
Department of Transportation (ADOT), highway contractors, materials
suppliers, materials testing laboratories, Arizona
Rock Products Association (ARPA), and Associated General Contractors
(AGC).